Effect of annealing environments on self-organized TiO2 nanotubes for efficient photocatalytic applications

Rajeshkumar Shankar Hyam, Jongseok Lee, Eunju Cho, Jeehyeong Khim, Haigun Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In the present study, amorphous titanium dioxide (TiO2) nanotubes were synthesized by one-step anodization technique and subsequently annealed in different environments to investigate the effect of annealing atmospheres on the formation of different crystalline phases. X-ray Diffraction (XRD) patterns clearly showed the presence of anatase TiO2 phase with various crystallite sizes. The samples annealed in oxygen and air atmospheres at 500 °C showed a dominant anatase phase and a small amount of rutile phase, on the other hand, the samples annealed in nitrogen and argon atmospheres and in a vacuum at 500 °C contained the anatase phase only. XPS analysis of the samples showed a broadening in the binding energy curves with respect to variation in annealing atmosphere, confirming the variation in surface defects, which in turn affect photocatalytic degradation. The vacuum-annealed sample showed superior photocatalytic degradation efficiency as it had relatively higher pseudo-first order rate constants (k) of 0.009/ min.

Original languageEnglish
Pages (from-to)8908-8912
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume12
Issue number12
DOIs
Publication statusPublished - 2012 Dec

Keywords

  • Anodization
  • Photocatalysis
  • Surface defect
  • TiO nanotube

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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